caa a22 4500 463234715 CHVBK 20180405153253.0 cr unu---uuuuu 170326e20070801xx s 000 0 eng 10.1007/s10853-006-1149-6 doi (NATIONALLICENCE)springer-10.1007/s10853-006-1149-6 Preparation, characterization and photocatalytic activity of TiO2 [Elektronische Daten] Methylcellulose nanocomposite films derived from nanopowder TiO2 and modified sol-gel titania / [Mohammad Habibi, Mojtaba Nasr-Esfahani, Terry Egerton] TiO2—methylcellulose (MC) nanocomposite films processed by the sol-gel technique were studied for phocatalytic applications. Precalcined TiO2 nanopowder was mixed with a sol and heat treated. The sol suspension was prepared by first adding titanium tetra isopropoxide (Ti(OPr)4 or TTP) to a mixture of ethanol and HCl (molar ratio TTP:HCl:EtOH:H2O=1:1.1:10:10) and then adding a 2wt.% solution of methylcellulose (MC). The TiO2 nanopowder was dispersed in the sol and the mixture was deposited on a microscope glass slide by spin coating. Problems of film inhomogeneity and defects which caused peeling and cracking during calcinations, because of film shrinkage, were overcome by using MC as a dispersant. Effect of MC on the structure evaluation, crystallization behavior and mechanical integrity with thermal treatment up to 500 °C are followed by SEM, XRD and scratch test. XRD Scanning electron microscopy (SEM) showed that the composite films with MC have much rougher surface than films made without MC. Composite films heat treated at approximately 500 °C have the greatest hardness values. For the composite thick film, the minimum load which caused the complete coating removal was 200g/mm2, an indication of a strong bond to the substrate. Photocatalytic activities of the composite film were evaluated through the degradation of a model pollutant, the textile dye, Light Yellow X6G (C.I. Reactive Yellow 2) and were compared with the activity of (i) a similar composite film without MC, and (ii) a TiO2 nanopowder. The good mechanical integrity make this composite film an interesting candidate for practical catalytic applications. Springer Science+Business Media, LLC, 2007 Habibi Mohammad Department of Chemistry, University of Isfahan, 81746-73441, Isfahan, Iran aut Nasr-Esfahani Mojtaba Department of Chemistry, University of Isfahan, 81746-73441, Isfahan, Iran aut Egerton Terry School of Chemical Engineering and Advanced Materials, University of Newcastle upon Tyne, Bedson Building, NE1 7RU, Newcastle, UK aut Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 6027-6035 0022-2461 42:15<6027 2007 42 10853 https://doi.org/10.1007/s10853-006-1149-6 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10853-006-1149-6 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Habibi Mohammad Department of Chemistry, University of Isfahan, 81746-73441, Isfahan, Iran aut NATIONALLICENCE 700 1- Nasr-Esfahani Mojtaba Department of Chemistry, University of Isfahan, 81746-73441, Isfahan, Iran aut NATIONALLICENCE 700 1- Egerton Terry School of Chemical Engineering and Advanced Materials, University of Newcastle upon Tyne, Bedson Building, NE1 7RU, Newcastle, UK aut NATIONALLICENCE 773 0- Journal of Materials Science Kluwer Academic Publishers-Plenum Publishers; http://www.springer-ny.com 42/15(2007-08-01), 6027-6035 0022-2461 42:15<6027 2007 42 10853 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer